/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <assert.h>
#include "../include/mystdlib.h"
#include "../include/searchutility.h"

namespace ime_pinyin {

    bool is_system_lemma ( LemmaIdType lma_id ) {
        return ( 0 < lma_id && lma_id <= kSysDictIdEnd );
    }

    bool is_user_lemma ( LemmaIdType lma_id ) {
        return ( kUserDictIdStart <= lma_id && lma_id <= kUserDictIdEnd );
    }

    bool is_composing_lemma ( LemmaIdType lma_id ) {
        return ( kLemmaIdComposing == lma_id );
    }

    int cmp_lpi_with_psb ( const void *p1, const void *p2 ) {
        if ( ( static_cast<const LmaPsbItem *> ( p1 ) )->psb >
             ( static_cast<const LmaPsbItem *> ( p2 ) )->psb )
        { return 1; }
        if ( ( static_cast<const LmaPsbItem *> ( p1 ) )->psb <
             ( static_cast<const LmaPsbItem *> ( p2 ) )->psb )
        { return -1; }
        return 0;
    }

    int cmp_lpi_with_unified_psb ( const void *p1, const void *p2 ) {
        const LmaPsbItem *item1 = static_cast<const LmaPsbItem *> ( p1 );
        const LmaPsbItem *item2 = static_cast<const LmaPsbItem *> ( p2 );
        // The real unified psb is psb1 / lma_len1 and psb2 * lma_len2
        // But we use psb1 * lma_len2 and psb2 * lma_len1 to get better
        // precision.
        Size_t up1 = item1->psb * ( item2->lma_len );
        Size_t up2 = item2->psb * ( item1->lma_len );
        if ( up1 < up2 ) {
            return -1;
        }
        if ( up1 > up2 ) {
            return 1;
        }
        return 0;
    }

    int cmp_lpi_with_id ( const void *p1, const void *p2 ) {
        if ( ( static_cast<const LmaPsbItem *> ( p1 ) )->id <
             ( static_cast<const LmaPsbItem *> ( p2 ) )->id )
        { return -1; }
        if ( ( static_cast<const LmaPsbItem *> ( p1 ) )->id >
             ( static_cast<const LmaPsbItem *> ( p2 ) )->id )
        { return 1; }
        return 0;
    }

    int cmp_lpi_with_hanzi ( const void *p1, const void *p2 ) {
        if ( ( static_cast<const LmaPsbItem *> ( p1 ) )->hanzi <
             ( static_cast<const LmaPsbItem *> ( p2 ) )->hanzi )
        { return -1; }
        if ( ( static_cast<const LmaPsbItem *> ( p1 ) )->hanzi >
             ( static_cast<const LmaPsbItem *> ( p2 ) )->hanzi )
        { return 1; }
        return 0;
    }

    int cmp_lpsi_with_str ( const void *p1, const void *p2 ) {
        return utf16_strcmp ( ( static_cast<const LmaPsbStrItem *> ( p1 ) )->str,
                              ( static_cast<const LmaPsbStrItem *> ( p2 ) )->str );
    }


    int cmp_hanzis_1 ( const void *p1, const void *p2 ) {
        if ( *static_cast<const char16 *> ( p1 ) <
             *static_cast<const char16 *> ( p2 ) )
        { return -1; }
        if ( *static_cast<const char16 *> ( p1 ) >
             *static_cast<const char16 *> ( p2 ) )
        { return 1; }
        return 0;
    }

    int cmp_hanzis_2 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 2 );
    }

    int cmp_hanzis_3 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 3 );
    }

    int cmp_hanzis_4 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 4 );
    }

    int cmp_hanzis_5 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 5 );
    }

    int cmp_hanzis_6 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 6 );
    }

    int cmp_hanzis_7 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 7 );
    }

    int cmp_hanzis_8 ( const void *p1, const void *p2 ) {
        return  utf16_strncmp ( static_cast<const char16 *> ( p1 ),
                                static_cast<const char16 *> ( p2 ), 8 );
    }

    int cmp_npre_by_score ( const void *p1, const void *p2 ) {
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->psb >
             ( static_cast<const NPredictItem *> ( p2 ) )->psb )
        { return 1; }
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->psb <
             ( static_cast<const NPredictItem *> ( p2 ) )->psb )
        { return -1; }
        return 0;
    }

    int cmp_npre_by_hislen_score ( const void *p1, const void *p2 ) {
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->his_len <
             ( static_cast<const NPredictItem *> ( p2 ) )->his_len )
        { return 1; }
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->his_len >
             ( static_cast<const NPredictItem *> ( p2 ) )->his_len )
        { return -1; }
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->psb >
             ( static_cast<const NPredictItem *> ( p2 ) )->psb )
        { return 1; }
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->psb <
             ( static_cast<const NPredictItem *> ( p2 ) )->psb )
        { return -1; }
        return 0;
    }

    int cmp_npre_by_hanzi_score ( const void *p1, const void *p2 ) {
        int ret_v = ( utf16_strncmp ( ( static_cast<const NPredictItem *> ( p1 ) )->pre_hzs,
                                      ( static_cast<const NPredictItem *> ( p2 ) )->pre_hzs, kMaxPredictSize ) );
        if ( 0 != ret_v )
        { return ret_v; }
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->psb >
             ( static_cast<const NPredictItem *> ( p2 ) )->psb )
        { return 1; }
        if ( ( static_cast<const NPredictItem *> ( p1 ) )->psb <
             ( static_cast<const NPredictItem *> ( p2 ) )->psb )
        { return -1; }
        return 0;
    }

    Size_t remove_duplicate_npre ( NPredictItem *npre_items, Size_t npre_num ) {
        if ( NULL == npre_items || 0 == npre_num )
        { return 0; }
        myqsort ( npre_items, npre_num, sizeof ( NPredictItem ), cmp_npre_by_hanzi_score );
        Size_t remain_num = 1;  // The first one is reserved.
        for ( Size_t pos = 1; pos < npre_num; pos++ ) {
            if ( utf16_strncmp ( npre_items[pos].pre_hzs,
                                 npre_items[remain_num - 1].pre_hzs,
                                 kMaxPredictSize ) != 0 ) {
                if ( remain_num != pos ) {
                    npre_items[remain_num] = npre_items[pos];
                }
                remain_num++;
            }
        }
        return remain_num;
    }

    Size_t align_to_Size_t ( Size_t size ) {
        Size_t s = sizeof ( Size_t );
        return ( size + s - 1 ) / s * s;
    }

}  // namespace ime_pinyin
